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Neural control of muscle movements in feeding behavior

Research Project

Project/Area Number 06671860
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Functional basic dentistry
Research InstitutionKobe University

Principal Investigator

NAGAHAMA Tatsumi  Kobe University, Faculty of Science, Associate Professor, 理学部, 助教授 (70145001)

Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1995: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1994: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsAplysia / Acetylcholine / Glutamate / ACh receptor / IJP / Cl channel / Feeding muscle / Motor control / グルタメート / 二重支配
Research Abstract

Major goal of our research is to know the neural mechanism generating feeding behavior in Aplysia which has simple nervous system. Jaw-closing (JC) muscle in a specific portion is doubly innervated by excitatory (JC) and inhibitory motor neurons (MAl) , which release glutamate (Glu) and acetylcholine (ACh) , respectively. On the other hand, redula-closer (ARC) muscle is innervated by cholinergic excitatory motor neurons. The purpose of this research is to know the characteristics the receptor and channels producing junction potentials, and also the modulatory mechanism of their function by central neurons. The muscle fibers were dissociated by using papain, and whole-cell patch clamp was performed on isolated single muscle cells to study the ionic mechanism associated with ACh or Glu reception. Iontophoretically applied ACh hyperpolarized the JC muscle cells while applied Glu depolarized the same cells, suggesting that ACh and Glu receptors coexist on the membrane of the single cell in the JC muscle. The experiments with different cation and anion compositions in the pipette solution showed that ACh-induced response in the JC muscle cells is caused by Cl^- currents while the response in the ARC muscle cells is cause by Na^+ and partly K^+ currents. These results suggest that the ACh receptors associated with a Cl^- channel in the JC muscle cells, and with a cation channel permeable to both Na+ and K+ in the ARC muscle cells. The effects of peptides (FMRF,Myomodulin A,SCP_A) widely found in Aplysia neurons and muscles on the inhibitory junction potentials (IJPs) were also explored. Application of these peptides reduced the size of IJPs produced in the JC muscle fibers by the MAl firing. In the whole cell clamp experiments, FMRF reduced Cl^- current induced by ACh application, suggesting that FMRF can modulate the function of ACh receptor channels.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] T.Nagahama: "Acetylcholine-activated chloride channels produce an inhibitory junction potential in buccal muscle cells of Aplysia." Proceedings of Royal Society of London Series B. 254. 275-280 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Nagahama: "Ionic basis of acetylcholine-induced currents mediating hyperpolarization of Aplysia jaw-closing muscles." The Japanese Journal of Physiology. 43(S). S169 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] I.Inoue: "Cl^- channels as a cholinergic ACh receptor responsible for generation of inhibitory junction potential in Aplysia buccal muscle cells." The Japanese Journal of Physiology. 44. S149-S155 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Nagahama: "Acetylcholine-activated two types of ion channels produce hyperpolarization or depolarization at different blocks of buccal muscle in Aplysia." Jouranal of Physiology (London). 480.P. 126- (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Nagahama, T., Inoue, I.& Takata, M.: "Acetylcholine-activated chloride channels produce an inhibitory junction potential in buccal muscle cells of Aplysia." Proc.R.Soc.Lond.B. 254. 275-280 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Nagahama, T., Inoue, I.& Takata, M.: "Ionic basis of acetylcholine-induced currents mediating hyperpolarization of Aplysia jaw-closing muscles." Jap.J.Physiol.43 (S). S169 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Inoue, I., Nagahama, T.& Takata, M.: "Cl_- channels as a cholinergic ACh receptor responsible for generation of inhibitory junction potential in Aplysia buccal muscle cells." Jap.J.Physiol.44. S149-155 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Nagahama, T., Inoue, I.& Takata, M.: "Acetylcholine-activated two types of ion channels produce hyperpolarization or depolarization at different blocks of buccal muscle in Aplysia." J.Physiol. (Lond.). 480.P. 126 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T. Nagahama: "Acetylcholine-activated chloride channels produce an inhibitory junction potential in buccal muscle cells of Aplysia." Proceedings of Royal Society of London Series B. 254. 275-280 (1993)

    • Related Report
      1995 Annual Research Report
  • [Publications] T. Nagahama: "Ionic basis of acetylcholine-induced currents mediating hyperpolarization of Aplysia jaw-closing muscles." The Japanese Journal of Physiology. 43(S). S169- (1993)

    • Related Report
      1995 Annual Research Report
  • [Publications] I. Inoue: "Cl^- channels as a cholinergic ACh receptor responsible for generation of inhibitory junction potential in Aplysia buccal muscle cells." The Japanese Journal of Physiology. 44. S149-S155 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] T. Nagahama: "Acetylcholine-activated two types of ion channels produce hyperpolarization or depolarization at different blocks of buccal muscle in Aplysia." Jouranal of Physiology (London). 480.P. 126P- (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] T.Nagahama: "Acetylcholine-activated chloride channels produce an inhibitory junction potential in buccal muscle cells of Aplysia." Proceedings of the Royal Society of London Series B. 254. 275-280 (1993)

    • Related Report
      1994 Annual Research Report
  • [Publications] T.Nagahama: "Ionic basis of acetylcholine-induced currents mediating hyperpolarization of Aplysia jaw-closing muscles." The Japanese Journal of Physiology. 43(S). S169- (1993)

    • Related Report
      1994 Annual Research Report
  • [Publications] I.Inoue: "Cl^- channels as a cholinergic ACh receptor responsible for generation of inhibitory junction potential Aplysia buccal muscle cells." The Japanese Journal of Physiology. 44. S149-S155 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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